CN1016993B - Method and regenerator for heating gases - Google Patents
Method and regenerator for heating gasesInfo
- Publication number
- CN1016993B CN1016993B CN89109229A CN89109229A CN1016993B CN 1016993 B CN1016993 B CN 1016993B CN 89109229 A CN89109229 A CN 89109229A CN 89109229 A CN89109229 A CN 89109229A CN 1016993 B CN1016993 B CN 1016993B
- Authority
- CN
- China
- Prior art keywords
- heat
- bed
- storage heater
- heat carrier
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
- F28D17/005—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using granular particles
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Furnace Details (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention relates to a method and a regenerator for heating gases, by alternatingly first heating heat carriers, preferably a bed of heat carrier bodies, and thereafter utilizing this energy stored by the heat carriers to heat cold gases. The essential feature of the invention is that a loose bed of the heat carriers is located between two coaxial and equidistant grates of the regenerator, and that the hot gas flows through this bed from the inside to the outside during the heating up phase of the regenerator and the cold gas flows through it in the reverse direction, from the outside to the inside, during the gas heating phase. This method and the regenerator provide advantages for gas heating due to lower thermal losses of the regenerator itself, and increased heat transmission is obtained due to large heat exchange surfaces of the heat carriers in a bed with a relatively low pressure loss for the gas flowing through.
Description
The present invention relates to a kind of gas heating means and a kind of storage heater, is to adopt over-over mode at first with the heat carrier heat temperature raising, utilizes the gas of the energy heats cold that heat carrier stores then.
Heat accumulating type gas heating principle has been known, and is applied to a plurality of industrial circles.For example, the used hot blast of blast furnace operating promptly is heated to about 1200 ℃ in hot-blast stove (Kao Bashi hot-blast stove).Furnace gas in the combustion chamber of hot-blast stove, burn the thermal energy transfer of giving birth to build thing by laying bricks or stones for the lattice formula refractory brick of filling in the stove, after the temperature rise period finishes, with the overheated brick lattice of cold air drum, and by the heat energy that is held heating, the used regenerator of open hearth and cell furnace is also all operated with the method.
For the gas of the continuous heats cold of energy, need also operate in this way by two storage heaters at least, one is being heated that is is storing heat, and the while, another heat with storage discharged to the cold air that blasts, thereby gas is heated.
When design and construction storage heater, always between the possibility of calorific requirement and construction, get it and trade off.For the used air blast of heating blast furnace operating, the hot-blast stove of known use is columnar, diameter about 1: 5 to aspect ratio.Used brick lattice are that gas flow to the end from the top in the temperature rise period, and the gas heating period be from underflow to the top, the time must consider heat transfer requirement between gas and the brick lattice in design, to consider that also the pressure of permitting when gas flows through these refractory materials falls.Though big surface area and narrow passage help conducting heat, the free cross-sectional area that flows through can only be reduced to a certain limit, remains on tolerance band so that stream pressure falls.The free cross-sectional area of gas channel more then impairs heat-transfer effect, so for desired blast temperature, just too high for making accumulation of heat build the required burning gas temperature of lattice intensification.For making hot blast temperature reach above-mentioned 1200 ℃, the flame temperature in the temperature rise period needs about 1500 ℃.The furnace gas of emitting by blast furnace just can not reach high like this flame temperature, so also will burn in addition in routine is implemented rich gas, for example natural gas.
A known method that improves the storage heater thermal efficiency is the surface of strengthening heat storage, existing in this regard multiple suggestion.Wherein a kind of special effective method is to use the roughly uniform material of granularity to become suitable bed to substitute aforesaid brick lattice.For example can use by refractory material finish mix grain.
The suitable bed that has a kind of storage heater to be to use oval ball of diameter 5-15 millimeter or spherical shape heat storage to be become, it can make the heat exchange active surface increase to such degree, when comparing with brick lattice, the temperature difference that the flame that the temperature rise period is used or the temperature of waste gas and gas heating period are heated between the gas approximately is 10 ℃.
Yet the block lattice in the used hot-blast stove of blast furnace operating are to substitute with the bed of an above-mentioned class, and are big to unpractical degree because the latter falls at the out-of-date pressure of air communication, and this is because the too high event of bed.
Too big for avoiding pressure to fall, existing suggestion is that the hot-blast stove diameter is strengthened significantly, for example reaches in the conventional structure diameter to the inverse value of aspect ratio, can fall to improve greatly under the condition in uniform pressure like this and conduct heat.Do and bring other shortcomings like this.During round dome above building heat carrier difficulty taking place, and proves that this hot-blast stove has shortcoming when operating.At first, switching to gas during the heating period by the temperature rise period, the round dome place bigger at volume causes losing than atmospheric; Secondly, the circle dome area is very big, and this high-temperature region heat leakage amount of hot-blast stove is increased; The 3rd, it is very big but relatively thin and the uniform bed of thickness safeguards that especially in operation such bed also is difficult unlikely to manufacture sectional area.
Therefore, The present invention be directed to the problems referred to above and a kind of gas heating means and used storage heater are provided, thereby can when heated air, avoid the shortcoming in the existing method and apparatus, can accelerate to conduct heat and reduce heat loss because of the average bed of thickness that adopts heat carrier especially, and pressure falls less when gas flows through.
The method of head it off of the present invention is the bed that the pine of described heat carrier is set between at least two coaxial and equidistant grid, and in the storage heater temperature rise period hot gas is from inside to outside flowed and by bed more earlier through heat-resisting low heat carrier through heat-resisting high heat carrier, the gas heating period then with on cold gas flowed from outside to inside and pass through.
The inventive method has been compared multiple advantages with the method that known regenerative process produces hot gas, comprises the advantage of fuel factor aspect and equipment construction aspect.Heat leakage is reduced, and this is because high-temperature area is positioned at equipment center, and outer wall only contact with cold gas, and the thermal efficiency is improved, and this is the one side advantage; On the other hand, the construction of storage heater also has obvious advantage, because with the known device of same capabilities is that the same gas disposal ability is compared with the known device of gas heating-up temperature, because equipment size is less and suffered heat effect is less, so required steel and refractory lining are all less.
Amazing is that the inventive method can make to the utmost point even temperature of gas heating, so do not need corresponding temperature control measure in many application scenarios.For example, when producing the hot blast that blast furnace uses, 1200 ℃ of hot blast temperatures with after switching to 30 minutes gas heating stages, the changing value of EGT can reach 20 °-40 ℃.
By the present invention, the temperature difference required between heat carrier and gas is less.This point is applicable to the intensification of heat carrier itself, also is applicable to by the intensification gas end temperature of air for example.When this heat carrier heats up, the temperature that the flame temperature of burning gases only needs a little higher than this cold air to be raised to.For example, in aeration gas when heating that is blast furnace, can use from the furnace gas of blast furnace or the furnace gas of enrichment a little.
When aeration gas being preheated to 1150 ℃ with the inventive method, in storage heater, use the furnace gas of the about 750 kilocalories/standard cubic meter of calorific capacity that heat carrier is heated, its flame temperature reaches about 1200 ℃.In fact, when the operating data of application of aforementioned heats other gases such as nitrogen, argon, oxygen-enriched air, oxygen and burning gases, can reach the same intensification temperature.
In the storage heater of the present invention, heat carrier is alternately to heat up and cooling, promptly earlier with it intensification, utilize the energy of storing in the heat carrier to come the gas of heats cold then, it is characterized in that it is the hot gas collecting chamber of symmetric figure about its central shaft that this storage heater has one, its formation is to comprise an interior grid and become at least one equidistant outer grid with grid in this, be arranged at a gas collection chamber between the grid and storage heater outer wall in addition, and gas is to cross the heat carrier that is arranged between these grids with radial flow.
Storage heater of the present invention is compared with known comparable equipment, and some obvious advantages are arranged.Used heat carrier is similar to the filling thing of aeration gas heater, is made up of the loose obturator of particle on a rough average.Because the bed of these heat carriers is to be arranged between the equidistant grid, be uniform along the layer thickness of gas flow direction.In addition, in storage heater of the present invention heat carrier not because of airflow influence moves, so the danger that does not have gas to burst, for example because fluidized point surpasses the boundary in the part.
In storage heater of the present invention, between the heat carrier and the free space in hot gas chamber and gas collection chamber all less, so switch to gas during the heating period from the temperature rise period, the gas loss amount is very little.
Storage heater of the present invention can be changed heat carrier in operating process.Top and bottom at bed are provided with suitable connectedness or ring flange, promptly can load heat carrier from mending on one side, take out heat carrier from another side.
Usually between the interior and outer grid of this storage heater, have only a kind of heat carrier of storing, can obtain the bed of homogeneous.
This storage heater is normally put heat carrier and is formed an even bed that has only a kind of heat carrier between interior and outer grid.But the scope of the invention comprises that also use more than two coaxial grids, just forms a plurality of coaxial annulars chamber.Between two adjacent cells, preferably use with a kind of heat carrier.But, also can in each doughnut, use different beds separately.For example, between two Turbogrid plates of storage heater internal high temperature, heat-resisting high heat-stable ceramic ball (for example using diamond spar) can be used, and heat-resisting low cheap heat carrier (for example using mullite and/or chamotte) can be used in the lower temperature district on outer limit.Whole bed can be divided into two-layer or multilayer, so not only meets economic principle, also match operation requirement, particularly heating condition requirement.By the present invention, the material of heat carrier, size and dimension can change.
The grid of storage heater of the present invention can be made with same material, but the most handy different materials.For example, the interior grid of high temperature can by refractory material for example refractory brick make, and have suitable airway, the external grid available metal of lower temperature is made, and for example makes with steel, non-scaling steel or cast iron.If used other grids between interior and outer grid, its material also must be selected by its situation of being heated.Main pottery or the metal material of using.
A most important characteristics of the present invention is to build the heat carrier bed of tool uniform thickness, and makes air-flow radially by this bed.If the heat carrier bed is divided into several layers, also keep this feature.
The appropriate materials that is used as heat carrier has confirmed it is the ceramic material of different quality grades, for example with corundum, mullite, chamotte, magnesia, chromium oxide, zirconia, carborundum based on and the ceramic material of any mixture, also comprise metal material.Must select according to their situation of being heated when certainly, selecting the heat carrier material.The shape of the used heat carrier of the present invention can be selected for use arbitrarily basically, but some shape is economical and be convenient to aspect the production to be comparatively superior, for example to adopt comminution granulation or the group's of pressure method, be specially adapted to ceramic material.From geometry, adopt oval sphere or spheroidal basically.But, any break or broken structure also is available.
Method of the present invention and storage heater are specially adapted to reduction of molten iron ore, electro-smelting and blast furnace.
The present invention is described in detail with an embodiment with reference to the accompanying drawings.
Fig. 1 is the cross sectional representation of a kind of regenerative furnace of the present invention.
This storage heater comprises that is roughly a spherical steel shell 1.But the profile of this storage heater is not very important, therefore can select arbitrarily, for example available upright cylindrical shape, (one is stacked in above another spherical and two truncated cone shapes, be with or without a cylindrical section shape interlude betwixt), all can implement from manufacturing engineering.
Comprise the outer grid 2 of cylindrical shape within the steel sheel 1, the opening of circle and/or line of rabbet joint shape is arranged above.Be that the gas that annular cooling gas is used collects 3 between grid 2 and steel shell body 1.
Interior grid 4 is to be built up by refractory brick, has suitable gas passage.Grid 2 and 4 coaxial-type are arranged and can guarantee that space 5 between them is all is equidistant along whole periphery between two grids.Space 5 carrying heat carrier 6, for example the useful ceramics grains of circular cross-section.
In the centre of this storage heater is the high-temperature gas chamber 7 of circular cross-section.When storage heater is in the temperature rise period, there is the high-temp waste gas that produces in the stove 8 to flow in the lower end of high-temperature gas chamber 7.Can be by container cover 9 places turnover stove 8.
Flow through from high-temperature gas chamber 7 grid 4 and by heat carrier bed 6 and inlet chamber 5 of the burning gases of high temperature, and then flow through grid 2 and enter gas collection chamber 3.When this gas is flowed through heat carrier bed 6, just be cooled, after arriving gas collection chamber 3, reach near normal temperature.Leave gas collection chamber from connector 10 then, also just left storage heater.
In the gas heating stage, the gas connector 11 of flowing through through pressurization enters gas collection chamber 3, and then by grid 2 and heat carrier bed 6 and inlet chamber 5 enters high-temperature gas chamber 7 by interior grid 4 again.When gas is flowed through the heat carrier bed 6 of high temperature and be heated, leave storage heater by connector 12 then.
Can also see opening 13 and 14 on this storage heater, they can be closed by the adapted ring flange.Heat carrier 6 in the chamber 5 can take out by connector 14, simultaneously can be by opening 13 heat carrier of packing into, and these can carry out in operation and when overhauling.Therefore can replace with the operation that is interrupted or continuation mode is replaced the heat carrier 6 in the chamber 5.
The industrial use that this method and described storage heater is applied to different condition is to belong to the scope of the invention.As previously mentioned, the used material of grid and heat carrier can be allocated by desired temperature.The shape of storage heater also can change by its purposes, but is to keep with the principle that Radial Flow flows through the heat carrier bed.
Claims (13)
1, a kind of storage heater that is used for heated air, its heating means are with hot gas heat carrier to be heated up earlier in an alternating manner, utilize the heat energy of storing in the heat carrier to come the gas of heats cold then, described storage heater has a symmetry axis, and comprise an outer wall, interior grid and at least one with should in grid partition distance and coaxial with it outer grid, a hot gas collecting chamber that is positioned within this grid, second gas collection chamber between grid and this storage heater outer wall outside this, described heat carrier comprise vicinity described in the first annular bed that constitutes by first heat proof material of grid, one described first heat proof material and described outside the second annular bed that constitutes by second heat proof material between the grid, the heat resistance of described first heat proof material is to be higher than described second heat proof material.
2, by the storage heater of claim 1, wherein said interior grid and outer grid are to be made by material inequality.
3, by claim 1 or 2 storage heater, wherein in this storage heater, be provided with at least plural described coaxial outside grid.
4,, wherein also comprise and to proceed to the device that small part is changed this heat carrier in any time of this storage heater operation by the storage heater of claim 1 or 2.
5, by the storage heater of claim 1 or 2, wherein said heat carrier is oval spherical pressure group, the ceramic material of sintering.
6, by the storage heater of claim 1 or 2, wherein said heat carrier is the pressure group of spheroidal, the ceramic material of sintering.
7, press the storage heater of claim 3, wherein at least two annular spaces are to be limited between described at least three coaxial grids, and wherein limit its that space on one side and contain corundum as heat carrier by interior grid, by the outermost grid limit its that space on one side contain be selected from mullite, chamotte and the mixture of the two material as heat carrier, and in aforementioned that space between the two by the material that is selected from corundum, mullite, chamotte and their mixture as heat carrier.
8, by the storage heater of claim 1 or 2, wherein said hot gas collecting chamber is a drum.
9, by the storage heater of claim 1 or 2, wherein said second gas collection chamber is annular.
10, by the storage heater of claim 1, wherein said heat carrier is to be selected from corundum, mullite, chamotte and their mixture.
11, a kind of method with the storage heater heated air, described method is to carry out in an alternating manner:
(1) the self-heating gas access also will be by the hot gas of the needs cooling that radially outward flows to collecting region in the future, (a) by a heat transfer zone, this district comprises at least two tools bed of uniform ring tee section basically, contain the graininess heat carrier in the bed, so take out heat energy from this gas at this place, and be stored in this heat carrier, and (b) send into a cold air inlet and collecting region; Then
(2) this heat transfer zone also will (a) be passed through by the cold air of the needs heating that radially inwardly flows to collecting region in self cooling gas access in the future, and (b) sends into this hot gas inlet and collecting region,
Its improvements are, at least one is with high heat-resisting heat carrier material in the bed of described tool ring section, at least one is with low heat-resisting heat carrier material, and in step (1), described hot gas at first feeds this heat-resisting high bed and is partly cooled off, and feeds this heat-resisting low bed then, in step (2), this cold air feeds heat-resisting low bed earlier and is partly heated, and feeds this heat-resisting high bed then.
12, by the method for claim 11, wherein the heat-transfer matcrial at the heat-resisting bed of described height is a corundum.
13, press the method for claim 11 or 12, wherein said heat transfer zone comprises the annular bed of at least three coaxial installations, and in the bed of contiguous this hot gas inlet and collecting region, its major part at least of heat carrier is made up of corundum, and in the bed of contiguous this cold air inlet and collecting region, its major part at least of heat carrier is the material that is selected from mullite, chamotte and the mixture of the two at least.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3841708.1 | 1988-12-10 | ||
| DE3841708A DE3841708C1 (en) | 1988-12-10 | 1988-12-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043198A CN1043198A (en) | 1990-06-20 |
| CN1016993B true CN1016993B (en) | 1992-06-10 |
Family
ID=6368926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89109229A Expired CN1016993B (en) | 1988-12-10 | 1989-12-08 | Method and regenerator for heating gases |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5052918A (en) |
| EP (1) | EP0373450A1 (en) |
| JP (1) | JP2509350B2 (en) |
| KR (1) | KR0131200B1 (en) |
| CN (1) | CN1016993B (en) |
| AU (1) | AU624450B2 (en) |
| DE (1) | DE3841708C1 (en) |
| HU (1) | HU206745B (en) |
| MX (1) | MX171490B (en) |
| SU (1) | SU1739857A3 (en) |
| ZA (1) | ZA899382B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4108744C1 (en) * | 1991-03-18 | 1992-08-27 | Atz Energie Umwelt Stroemungstechnik | Gas heating jacketed regenerator with heat storage medium - has central chamber surrounded by layer of pebbles or granular material |
| DE4236619C2 (en) * | 1992-10-29 | 1996-11-28 | Air Liquide | Process and regenerator for heating gases |
| BE1006702A6 (en) * | 1993-02-10 | 1994-11-22 | Distrigaz Sa | Heating device for a gas fluid. |
| US5419388A (en) * | 1994-05-31 | 1995-05-30 | Fluidyne Engineering Corporation | Regenerative heat exchanger system and an operating method for the same |
| ATE224463T1 (en) * | 1997-07-18 | 2002-10-15 | Didier M & P Energietechnik Gm | GRID FOR A WINDOW HEATER |
| DE19744387C1 (en) * | 1997-10-08 | 1999-04-29 | Atz Evus Applikations & Tech | Device for reducing stress in bulk flow regenerators with radial flow |
| US6631754B1 (en) * | 2000-03-14 | 2003-10-14 | L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Regenerative heat exchanger and method for heating a gas therewith |
| KR100463550B1 (en) * | 2003-01-14 | 2004-12-29 | 엘지전자 주식회사 | cooling and heating system |
| DE102010047025A1 (en) * | 2010-09-30 | 2012-04-05 | Uhde Gmbh | Apparatus and method for establishing a control element for controlling the gas pressure of a coke oven chamber without strain-related deviation of the control arrangement |
| GB2485836A (en) * | 2010-11-27 | 2012-05-30 | Alstom Technology Ltd | Turbine bypass system |
| DE102012016142B3 (en) | 2012-08-08 | 2013-10-17 | Saarstahl Ag | Hot blast lance with a nozzle block arranged at the hot blast outlet |
| DE102012023517A1 (en) * | 2012-11-30 | 2014-06-05 | Saarstahl Ag | Method for operating a regenerator (Pebble Heater) and regenerator itself |
| CN103032961B (en) * | 2012-12-20 | 2015-07-15 | 北京航空航天大学 | Anti-slag high-temperature and high-pressure pure air heat storage type heating system |
| CN103901134A (en) * | 2014-04-15 | 2014-07-02 | 安徽中烟工业有限责任公司 | Measurement device for HCN releasing amount in oxygen-poor combustion of tobaccos |
| CN105318758A (en) * | 2014-07-04 | 2016-02-10 | 陕西科弘厨房工程设备有限公司 | Heat-conducting-oil/corundum-ball double-medium heat storage device |
| CN107990760A (en) * | 2017-12-30 | 2018-05-04 | 肖英佳 | The anhydrous domestic radiator of safety |
| CN110553527A (en) * | 2019-07-23 | 2019-12-10 | 周昊 | Multilayer packed bed heat-retaining device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL298230A (en) * | 1900-01-01 | |||
| US2272108A (en) * | 1940-01-19 | 1942-02-03 | Research Corp | Regenerative stove |
| US3378244A (en) * | 1966-01-12 | 1968-04-16 | Dresser Ind | Pebble heat exchanger |
| AT327363B (en) * | 1974-02-25 | 1976-01-26 | Boehler & Co Ag Geb | REGENERATIVE HEAT EXCHANGER FOR GASES |
| DE2751621C2 (en) * | 1977-11-18 | 1986-08-21 | Linde Ag, 6200 Wiesbaden | Hot blast stove |
| FR2473695A1 (en) * | 1980-01-09 | 1981-07-17 | Pechiney Aluminium | CYCLE INVERSION HEAT RECOVERY EXCHANGER AND APPLICATION TO HEAT RECOVERY IN FUME FLAME FURNACE |
| JPS56130528A (en) * | 1980-03-18 | 1981-10-13 | Kikuko Kobayashi | Heat accumulating device |
| US4604051A (en) * | 1984-08-16 | 1986-08-05 | Gas Research Institute | Regenerative burner |
| GB2170584B (en) * | 1985-02-04 | 1988-02-17 | British Gas Plc | Regenerative heating systems |
| EP0266463A1 (en) * | 1986-11-04 | 1988-05-11 | British Gas plc | A regenerator for a regenerative heating system |
-
1988
- 1988-12-10 DE DE3841708A patent/DE3841708C1/de not_active Expired
-
1989
- 1989-11-29 AU AU45672/89A patent/AU624450B2/en not_active Expired
- 1989-12-01 EP EP89122226A patent/EP0373450A1/en not_active Withdrawn
- 1989-12-01 US US07/444,231 patent/US5052918A/en not_active Expired - Lifetime
- 1989-12-06 HU HU896446A patent/HU206745B/en not_active IP Right Cessation
- 1989-12-07 ZA ZA899382A patent/ZA899382B/en unknown
- 1989-12-08 MX MX018647A patent/MX171490B/en unknown
- 1989-12-08 SU SU894742577A patent/SU1739857A3/en active
- 1989-12-08 JP JP1317898A patent/JP2509350B2/en not_active Expired - Lifetime
- 1989-12-08 CN CN89109229A patent/CN1016993B/en not_active Expired
- 1989-12-09 KR KR1019890018244A patent/KR0131200B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| MX171490B (en) | 1993-10-29 |
| HU896446D0 (en) | 1990-02-28 |
| EP0373450A1 (en) | 1990-06-20 |
| CN1043198A (en) | 1990-06-20 |
| AU624450B2 (en) | 1992-06-11 |
| US5052918A (en) | 1991-10-01 |
| DE3841708C1 (en) | 1989-12-28 |
| ZA899382B (en) | 1990-08-29 |
| KR900010008A (en) | 1990-07-06 |
| HUT56142A (en) | 1991-07-29 |
| AU4567289A (en) | 1990-07-19 |
| HU206745B (en) | 1992-12-28 |
| JP2509350B2 (en) | 1996-06-19 |
| SU1739857A3 (en) | 1992-06-07 |
| JPH02272256A (en) | 1990-11-07 |
| KR0131200B1 (en) | 1998-04-15 |
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